CN103030161B - Application of filter cake of leaf filter - Google Patents
Application of filter cake of leaf filter Download PDFInfo
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- CN103030161B CN103030161B CN201210562200.7A CN201210562200A CN103030161B CN 103030161 B CN103030161 B CN 103030161B CN 201210562200 A CN201210562200 A CN 201210562200A CN 103030161 B CN103030161 B CN 103030161B
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- filter
- leaf
- filter cake
- stripping
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Abstract
The invention discloses application of a filter cake of a leaf filter. In the application, the filter cake of the leaf filter, which is generated in the alumina production, is used as an additive to be applied to catalyze dissolution of aluminium oxide in monohydrate bauxite ore. The application can effectively catalyze dissolution of the aluminium oxide, adopts a simple process and has a good industrial application prospect.
Description
Technical field
The present invention relates to the application of leaf filter filter cake, belong to alumina producing industrial circle.
Technical background
In alumina producing, after dissolved mineral slurry diluted settlement, obtain thick liquid and red mud respectively, need to carry out leaf filter containing a large amount of sestons in thick liquid and the fine red mud in thick liquid is separated with sodium aluminate solution, and obtain pure sodium aluminate solution and seminal fluid.Red mud grains in thick liquid is less, and the filter cake formed when leaf is filtered is comparatively closely knit easily blocks filter cloth, and reduces the production of leaf filter rate, in order to solve such problem, alumina producer filters the general lime that adds in journey at leaf and, as filtration medium, improves leaf filter efficiency, improve its production capacity.
The lime added during leaf filter and sodium aluminate solution reaction, form aluminate hydrates DFP filter cake, after leaf filter, filter cake generally adds laterite washing flow process, is sent to red mud dump, becomes waste material with red mud, after leaf filter, directly abandonment can cause the wasting of resources and production cost to increase, particularly when producing unstable, in order to ensure the effect that leaf is filtered, the amount of lime of interpolation is larger, the filter cake amount produced after leaf filter is large, and the impact that this wasting of resources and production cost increase is particularly serious.
At present, application for filter cakes of leaf filter is little, horse naval propose in " discussion about improving Bayer processing plants causticization process " literary composition (" light metal " 2012 the 6th phase the 9th page) using leaf filter cake as causticizing agent during Bayer process causticization to replace milk of lime make for, be used for causticization; In addition, then without any relevant report utilizing filter cakes of leaf filter.
Summary of the invention
Leaf is the object of the present invention is to provide to filter the application of filter cake, with the stripping of leaf filter filter cake as aluminium sesquioxide in catalyzer efficient catalytic monohydrate bauxite ore.
The invention provides the application of leaf filter filter cake, this application is that the leaf produced in alumina producing is filtered the stripping of filter cake as additive application aluminium sesquioxide in catalysis monohydrate bauxite ore.
Above-mentioned application is in alumina producing, adds lime, the slurries that obtain refiltered after being filtered by leaf in the thick liquid of dissolved mineral slurry, or filters after the slurries obtained after leaf filter are carried out sedimentation; The leaf filter filter cake obtained after filtration adds to as leaching additive in the circulating mother liquor in monohydrate bauxite ore stripping stage and is applied to catalysis Al
2o
3stripping.
Leaf filter filter cake after filtering in above-mentioned application comprises the calcium aluminate compound of aluminate hydrates DFP, in leaf filter filter cake with the mass content of CaO form metering for 20 ~ 60%, with Al
2o
3the mass content of form metering is 10 ~ 40%.
Solid content in filter cake slurries in above-mentioned application after sedimentation controls at 300 ~ 900g/L.
Add in bauxite stripping using leaf filter cake as leaching additive in above-mentioned application, consumption is 0.5 ~ 50% of bauxite quality; Be preferably 15 ~ 35%.
The present invention is the large quantity research of contriver by carrying out monohydrate bauxite ore stripping, the leaf filter filter cake adding the primary aqueous conjunction tricalcium aluminate composition that lime is formed when finding leaf filter has and has catalytic activity to the stripping of aluminium sesquioxide, part can be carried out as additive and replace lime, katalysis is risen to stripping; Leaf filter filter cake is that a kind of aluminate hydrates DFP main component that contains is at interior compound, these compounds can make bauxite not by the impact of titanium-containing compound when stripping, be conducive to mass transfer process, thus accelerate the speed of stripping, this catalytic mechanism is also a complicated comprehensive catalytic process; Find that the aluminium element in leaf filter filter cake can enter sodium aluminate solution and be recovered in process in leaching simultaneously, while reaching catalysis, also reclaimed the aluminium component in leaf filter filter cake.
Application of the present invention has following advantage:
The present invention utilizes industry generally to filter filter cake as additive as the leaf of the cheapness of offal treatment, greatly enhances the solubility rate of aluminium sesquioxide in monohydrate bauxite ore; The aluminium component in filter cake can be reclaimed; Present invention process is simple, therefore has good prospects for commercial application.
Embodiment:
The following examples can make those skilled in the art understand the present invention more all sidedly, but do not limit the present invention in any way, and content of the present invention is not limited to this completely.
In order to better understand this patent content, the symbol definition used in invention book is as follows:
R
p: the ratio of aluminum oxide and caustic alkali mass concentration in sodium aluminate solution;
Na
2o
k: caustic alkali, represents with the alkali that sodium aluminate and NaOH form exist in sodium aluminate solution, with Na
2o counts, g/L;
Na
2o
c: carbonic acid alkali, represents with Na
2cO
3the alkali that form exists, with Na
2o counts, g/L;
Na
2o
t: full alkali, Na
2o
kand Na
2o
csummation, g/L;
η
phase: alumina phase to solubility rate, %;
Al
2o
3: alumina content, with Al
2o
3form represents the aluminium in sodium aluminate solution, g/L.
Stripping reaction is carry out in the steel bomb reactor of 120ml at volume, the circulating mother liquor that the circulating mother liquor used in comparative example and embodiment is China's alumina producer, because the time of sampling is different, its composition is slightly different, concrete composition is as shown in table 1, uses circulating mother liquor 100ml during stripping at every turn.The ore used is the bauxite of the use of Chongqing alumina producer, and its composition is as shown in table 2, and wherein mainly containing aluminium thing is a diaspore type mutually.The leaf filter filter cake that the leaf filter filter cake used is Chongqing alumina producer, its main component is aluminate hydrates DFP, and for calculating accurately, use after being dried in 100 DEG C of baking ovens by filter cake, concrete composition is as shown in table 3.Stripping temperature of reaction is 240 DEG C, and the reaction times is 1h.After stripping reaction terminates, filtered while hot, and get solution sample, uses the content of aluminum oxide and caustic alkali in the methods analyst solution of chemistry titration, total alkali.
The composition of table 1 circulating mother liquor
| Composition | Al 2O 3（g/L） | Na 2O k（g/L） | Na 2O T（g/L） | Rp |
| Circulating mother liquor a | 109.7 | 206.5 | 227.0 | 0.531 |
| Circulating mother liquor b | 118.6 | 222.5 | 240.7 | 0.533 |
Table 2 bauxite composition
| Composition | Al 2O 3（%） | SiO 2（%） | TiO 2（%） | Fe 2O 3（%） | A/S |
| Content | 58.56 | 16.06 | 2.83 | 5.76 | 3.65 |
Table 3 filter cake main component
| Composition | Al 2O 3（%） | CaO（%） |
| Content | 26.50 | 40.59 |
Comparative example:
Circulating mother liquor a100mL, bauxite 18.86g, do not allocate any additive in autoclave, stirs, carry out stripping reaction.Solution composition after stripping and the red mud composition obtained are as following table 4 and table 5, and the alumina content in the solution after stripping is 115.5g/L, and the relative solubility rate of aluminum oxide is 5.25%.
The composition of liquid after the stripping of table 4 comparative example
| Composition | Al 2O 3（g/L） | Na 2O k（g/L） | Na 2O T（g/L） | Rp |
| Content | 115.5 | 167.5 | 186.9 | 0.69 |
The composition of red mud is obtained after the stripping of table 5 comparative example
Embodiment 1:
Circulating mother liquor b100mL, bauxite 15.99g, add in autoclave using leaf filter cake as leaching additive, and the quality of the leaf filter filter cake of interpolation equals 18.95% of bauxite quality, stirs, carries out stripping reaction.Solution composition after stripping and the red mud composition obtained are as following table 6 and table 7, and the alumina content in the solution after stripping is 191.4g/L, and the relative solubility rate of aluminum oxide is 77.29%.
The composition of liquid after the stripping of table 6 embodiment 1
| Composition | Al 2O 3（g/L） | Na 2O k（g/L） | Na 2O T（g/L） | Rp |
| Content | 191.4 | 197.3 | 222.8 | 0.97 |
The composition of red mud is obtained after the stripping of table 7 embodiment 1
Embodiment 2:
Circulating mother liquor b100mL, bauxite 15.99g, add in autoclave using filter cake as leaching additive, and the quality of the leaf filter filter cake of interpolation equals 26.95% of bauxite quality, stirs, carries out stripping reaction.Solution composition after stripping and the red mud composition obtained are as following table 8 and table 9, and the alumina content in the solution after stripping is 202.1g/L, and the relative solubility rate of aluminum oxide is 84.90%.
The composition of liquid after the stripping of table 8 embodiment 2
| Composition | Al 2O 3（g/L） | Na 2O k（g/L） | Na 2O T（g/L） | Rp |
| Content | 202.1 | 206.8 | 232.6 | 0.9773 |
The composition of red mud is obtained after the stripping of table 9 embodiment 2
Claims (2)
1. the application of leaf filter filter cake, is characterized in that, in alumina producing, add lime and carry out leaf filter in the thick liquid of sedimentation, the filter cake slurries that obtain is filtered after being filtered by leaf, or refilters after the slurries obtained after leaf filter are carried out sedimentation; The leaf filter filter cake obtained after filtration adds to as leaching additive in the circulating mother liquor in monohydrate bauxite ore stripping stage and is applied to catalysis Al
2o
3stripping; Wherein, leaf after filtration filter filter cake comprises the calcium aluminate compound of aluminate hydrates DFP, in leaf filter filter cake with the mass content of CaO form metering for 20 ~ 60%, with Al
2o
3the mass content of form metering is 10 ~ 40%; The addition of leaf filter filter cake in circulating mother liquor is 15 ~ 35% of monohydrate bauxite ore quality.
2. the application according to right 1, is characterized in that, the solid content in the filter cake slurries after sedimentation controls at 300 ~ 900g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210562200.7A CN103030161B (en) | 2012-12-21 | 2012-12-21 | Application of filter cake of leaf filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210562200.7A CN103030161B (en) | 2012-12-21 | 2012-12-21 | Application of filter cake of leaf filter |
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| Publication Number | Publication Date |
|---|---|
| CN103030161A CN103030161A (en) | 2013-04-10 |
| CN103030161B true CN103030161B (en) | 2015-04-08 |
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|---|---|---|---|
| CN201210562200.7A Expired - Fee Related CN103030161B (en) | 2012-12-21 | 2012-12-21 | Application of filter cake of leaf filter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152195B (en) * | 2015-08-31 | 2017-04-19 | 中国铝业股份有限公司 | Treatment method and apparatus for controlled filter cakes in Bayer process for alumina production |
| CN113998719A (en) * | 2021-07-28 | 2022-02-01 | 国家电投集团山西铝业有限公司 | Use of leaf filter cake in production of alumina and alumina production method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102398914A (en) * | 2010-09-10 | 2012-04-04 | 中国科学院过程工程研究所 | Method for modifying Bayer process, processing low-grade diaspore bauxite and producing alumina |
| CN102730725A (en) * | 2012-06-21 | 2012-10-17 | 中国铝业股份有限公司 | Method for improving caustic ratio of Barer process seeded precipitation mother solution |
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| KR20080082751A (en) * | 2007-03-09 | 2008-09-12 | 케이씨 주식회사 | Manufacturing method of ultra fine aluminum hydroxide |
| CN100532262C (en) * | 2007-07-12 | 2009-08-26 | 中国铝业股份有限公司 | Method for producing aluminium oxide by middle-low grade alumyte |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102398914A (en) * | 2010-09-10 | 2012-04-04 | 中国科学院过程工程研究所 | Method for modifying Bayer process, processing low-grade diaspore bauxite and producing alumina |
| CN102730725A (en) * | 2012-06-21 | 2012-10-17 | 中国铝业股份有限公司 | Method for improving caustic ratio of Barer process seeded precipitation mother solution |
Non-Patent Citations (1)
| Title |
|---|
| "关于改进拜耳法工厂苛化工艺的探讨";马海军等;《轻金属》;20120929(第6期);第9-13页 * |
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